Finally discovered the root cause to a problem on my 1998 ML320 (190k miles). The ABS/ETS warning light is on. The trouble code is C1304 which indicates a fault in the left rear HOLD solenoid. The dealer wanted to replace the ABS Hydraulic Unit and Control module @ $2,200. This work was declined and the vehicle was driven home without ABS.

Upon further examination, the actual fault is the pink wire that goes to PIN #10 in the 15 pin connector attached to the ABS Hydraulic Pump/Control Module unit (A7/3). This pink wire is completely abraded to the point that there is no copper conductor remaining. According to the wiring diagram, PIN#10 pink wire does indeed feed the left rear hold solenoid so this checks out with code C1304. Three questions for now related to the wiring repair:

1. What is the recommended splicing procedure, e.g. twist ends & solder then wrap, butt connector, insulation displacement connector, etc. ?

2. I may have done some damage to the 15 pin connector….not certain until I reassemble. What tool is used to remove the metallic terminals from the 15 pin connector block?

2.1 Are replacement connector blocks available or does MBUSA sell a pigtailed replacement and all 15 wires must be spliced?

Thank you,
Ken

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